Finding the Fourth Proportional to 72.72, 109.17 and 40.28

Step by Step Solution

1. Step 1: Write the proportion equation
   72.72 : 109.17 = 40.28 : x
2. Step 2: Convert to fraction form
   72.72/109.17 = 40.28/x
3. Step 3: Cross multiply
   72.72x = 109.17 × 40.28
4. Step 4: Simplify right side
   72.72x = 4,396.82
5. Step 5: Solve for x
   x = 4,396.82/72.72
6. Step 6: Final answer
   x = 60.46